Compensating bolt connection.



G. F. KAHLER.

GOMPBNSATING BOLT CONNECTION. APILIGATION FILED $0121, 1911v 1,046,6009Patented Dec. 10, 1912.

t y 3i ZTI@ j E l wf l/ 0'( Mw being curved 4b is well adapted, is aso-called UNITED sTATEs PATENT oEEioE CHARLES E.' KAHLER, or CLEVELAND,omo.

COMPENSATIN G B OLT CONNCTION.

To all whom it may conicem: v

Beit known that I, CHARLES F. KAHLER, a citizen of the United States,residing at Cleveland, in the county of Cuyahoga and State of Ohio, haveinvented a certain new and useful Improvement in Compensating BoltConnections, of which the following is' I may be said to consist broadlyof a connecting member,

. mentioned.

- concave surfaces mentioned interposed between the connecting memberand seat, the engaging surfaces of such parts tov allow a compensatingtipping of the intermediate member in case of relative movement bet-Weenthe connecting member and seat. l

More particularly, hends a device for forming a self-adjusting seat forthe end of Val tension member and, in-that aspect, includesthecombination of a tension rod having a convex Vex seat facing theconvexity and engage the convex surfaces I have found that the bestrethe convex and zones of the same sphere, and my invention includesalso such characteristic.- A specific -instance of the tension rod andseat last referred to, to which my invention liexible stay- Sults areobtained by making bolt adaptedv to be connected with two boiler isheets to form a tie between them, while allowing one sheet to expand orcontract with reference to the other. Such stay bolts are expansion andcontraction of the inner sheet it has been customary to make the outerend with a spherical seat mounted iii abushing secured in the outersheet. vices, if the stay bolt is screwed tight in the inner sheet,there is always a stay bolt during the expansion or contraction, withconsequent tendency to loosen Specication of Letters Patent.AApplication filed November 27, 1911.

, this end. I

a seat and a movable member y -which has a changeable the inventioncomprev With such de-v bending of thev Patented Dec. 10, 1912. serialNo. 662536.

while, to secure the bolt flexibly tothe inner sheet not only increasesthe expense, but introduces difficulties in the way ofinaccessiblemovable parts, which being adjacent to the fire box, are liable tobecome ineffective. In addition to the generali applications -vofmyfdevice, one of the objects of my invention is to provide a 'stay bo't with fastening means so arranged that th vshifting of Vone end of thebolt will not trow astrain on the bolt or the fastening in the othersheet, or tend to loosen the bolt or fastening. To

tight to the inner sheet and may on the outer sheet, so that the boltmay change its place as the inner sheet expands or contracts withoutbendingthe bolt.

The invention in the more particular aspeet now under considerationincludes the means by which I accomplish this, comprisprovide a boltwhich is secured' shift bodilying broadly a bolt secured tightly to the,in-

ner. sheet and seating .on seat on a bushing secured to the outer sheet.f

The inner side of my bolt head isspherically formed and the outer faceof the bushing is spherical about the same radius, andl the movablemember is spherically concave on both sides on the same radius. n Withsuch construction, when the inner end of the bolt changes position, thebolt does not bend, but the outer end shifts, riding up or down on t emovable niember which, inl turn, rides down or up on the face of thebushing.

A satisfactory form of which is also comprised within my inven' tion, isshown'iii'the drawing hereof and is hereinafter more fully described. iIn the drawing, Figure 1 is a transverse section through 'two boilersheets provided with a stay bolt of my invention connecting them; Fig5 2is a cross sectio of the stay boltv and its cap ontliey line designated2*.2 of Fig. 1; Fig. 3 Ais a perspective view of the movable mem seats;-Fig. 4 is a diagram in the nature'of an enlarged section, illustratingthey curvature ofl the movable member and the cooperating surfaces. i l

.As shown in Fig. 1, l0 represents `the inner boiler sheet, and 1l theouter sheet.

a movable member,

my stay bolt,l

loq

12 is a bushing having Iexternal screwV shown at 15, andrb'eyond thisspherical portion there is an annular an'ge having external threads 16.indicates the stay bolt proper. This is shownv as having screw threads21 by which it engages the inner1 sheet, the end of the bolt being upsetat 22' on the fire side of thisv sheet to make a tight and permanentconnection. Nea-r its outer end the bolt is provided with the head 24,which has -on its under portion about the shank a spherical zone 25.vBetween the zone 25 of the bolt and the zone or seat 15 of the bushingis a movable ring 30. This ring vhas a central opening 31 larger thanthe diameter of the bolt 20, and on its upper and lower face it isconca'ved spherically on the same radius as the zones 15 and 25. This is'illustrated in Fig. 4,

wherein the radius of the zone 15 and the l under face of the ring isdesignated a, and the radius of the upper face of the ring and the zone25 is designated a. These two radii are equal.

' roundi'n In installing .the construction above described, the bushing12 is screwed in the outer sheet,l and the bolt, with the ring surit,has its shank passed through the bushing and screwed tight into theinner sheet. For this purpose' the bolt may have an angular socket 27 inits upper end, or it may be otherwise. formed for engagement by asuitable wrench. When in place the inner end of the bolt is upset-, asshown in Fig. 1.

In this position of the boltthe ring is clamped snugly between the bolthead and the face of the bushing. Now, in such construction, if theexpansion or contraction of the inner sheet tends to move the bolttoward' the right 'of Fig. 1, for example, the

'ring' 30 moves toward the right so that it travels downwardly on thespherical seat 15, causing the left hand portion' to rise. At the sametime,-the bolt head slides downwardly on the rising rides up on thefalling right hand portion. Accordingly, an automatic adjustment takesplace towardthe right,.half of the movement being between the ring 30and the scat 15 and the other half between'the head and Athering. Theoperation is similar for-any direction of movement of the bolt. Part ofthe movement is taken by the change of the ring on the seat 15 and partby the change the combination convexity of thehead,

leftl hand portion and the combination of a tensionmembenjafheadrqundingthe rod, a bushingloo'sely sur-j usucli cap in Figs1Iand22desi'gnated 40a itl has an yarched top-port1on distance As shown,standing some head, and itswwall` is ternal thread 41 by which it may.be screwed onto the thread 16. To enable itto be conveniently turned Ibe conveniently applied.

Among the advantages of the structure shown, it should also be mentionedthat the accessible without'danger of loosening the bolt or the soaccessibility provides for'test-ing the lbolt whenever desired. y y

Having thus described my invention, what I claimis:

outside of the-bolt rovided withan 'inflatten its-exterior surface, asshown at 42, whereby a'w'rench may head of the vbolt is readily andconveniently ket in the boiler sheet. This 1. In a device of thecharacter described,

the combination `of a connecting member, a seat and a member connectingmember with reference to both of them, the'engaging surfaces of saidseat and interposed member and of said interposed member andl co`n'necting member respectively being loppositely curved to allow acompensating tipping of .the interposed member in case of relativemovement between .theconnecting member and seat. y

2. In a device. of the character described,

of a tension member. having a head with a convex face, a seat, ringinterposedbetween the and seat and movable f loosely surrounding thetension member bef .tween the seat and head and movable with vreferencevto boththe member and seat. and lhaving `a concave surface whichthe'said convex head lengages and a vsurface non-concentric therewithwhichengages the seat.'y

3. The combination of a tension rod .having aconvex head, a convex seatfacing the and-aninterposed an-l nular member loosely surrounding. therod and concave on its opposite sides to engage' the .convex surfacesmentioned.

4. The combination of a member having. a convex head, aV convex vseatfacing; the convexity of the head, and an interposed member concave onits opposite sidesto engage the convex surfaces mentioned;y all ofsuchconcave and -convex'vsurfaces being. spherical.v and of the same radiusy5. vIn a device of the character described, i

thereon having' an annular spherical` convex surface,y an annular seatysurrounding the vtension member having a spherica convex surface, andanintcrposed ring surrounding -the'tensionl 'l' engage said convexmember and having its opposite faces spherically concave to surfacesrespectively.

A6. The combination of'l a` reid" provided i with a head which has aconvex surface sur.-

the rod and bearing at one side on the `terposed ring having vwhich 'are'convexly formed `to seat it, there- 'into the outer sheet and having anoutegf rounding the rod and providing a seat, and an intermediate memberbetween the bushing and head and movable with reference to both of them,saidintermediate member being in the form of a ring having an innerdiameter greater than the diameter of end and havinga head at the otherend with a spherical convex inner face, a bushing having a sphericalconvex face, and a ring surrounding the shank and located between thehead and bushing and having its inner and outer faces correspondinglyeoncaved to engage such convexed faces respectively. 13. Thecombinationl of a bolt having a head and a shank and an intermediateportion connecting the head and shank and having a convex sphericalsurface, a bushing surroundingl said shank and having an outerconvexspherical curved face, a mov' able intermediate ring adapted' tosurround the bolt 4shank and having concave inner and outer surfacesfaces respectively, 'the bushing having an external screw thread bywhich it may be screwed into the outer sheet, and the shank of the bolthaving an external screw thread by which it maybe screwed into the innersheet. 14. The combination of a bolt having a head at one end and ashank connected with the head by a flaring portion which has a sphericalface. a bushing adapted to surround said bolt. face which iscorrespondingly spherical, a movable intermediate ring adapted tosurround the bolt shank and having concave inner and outer surfaceswhich are complementarilv spherical. the. bushing having externalscrew-threads b v which it may be screwed into the outer sheet, andhaving a flange outside of the seat thereon, which flange has externalscrew threads. and a cap adapted to inclose the. head and ring and thesheets. l screwed onto said last ment-ioned threads. l0. rl`hecombination. with the inner and l 15. Ina device ofthe characterdescribed, outer sheets of a boiler, .of a stay bolt i the combinationof a seat, a connecting memscrewed into the inner sheet, a bushing ber,and a member interposed between the screwed into the outer sheet, and aring be-' Seatand connecting memberand having nontween the' head of thebolt and the bushing i concentric surfaces bearing on each of themconcav'ed on its opposite sides and movable l and being movable .withreference to both with reference to both the bolt and bushing I of them.1G Ina compensatingbolt connection7 the combination of a bolt having ahead, an

l annular seatsurrounding the bolt and free i threaded on one bushingand shiftable thereon in a direction non-concentric of the head and onits other side formed concavelv corresponding to the convexituv of thehead.

7. In a device of the character described, the combination of a rodprovided with a head vwhich has a convex seating surface. a bushingadapted to loosely surround the rod and having a convex seating surface,an inits lopposite faces formed concavely and bearing against the headand bushing, all of such convex and concave .surfaces being sphericaland ofthe same radius.l

S. The combination with outer sheets of a boiler of a stay-bolt securedat its inner end to the inner sheet and having a head at its outer end,and. a shiftable member interposed between the head and outer sheetadapted to enable the head to slide parallel with the outer sheet androck with reference thereto. l

9. The combination. with the inner and, outer sheets of a boiler, of astay bolt screwed into the'l inner sheet. a bushing secured to the outersheet, and a member between the head of'the bolt and the bushing andmovable with reference to both of them I and provided withnon-concentric opposite I the inner and faces enabling the boltto bodilyshift and still maintain a tight connection between by enabling the boltto shift and the ring on the bushing.

11. The combination, with theinner and outer sheet' of a boiler. of astay bolt screw threaded into the inner sheet 'and having a head, theinner side of which has a convex spherical curvature. a 'bushing'surroundin the shank of the bolt and screw threaded from 1t, and a rlnfrinterposed between the bolt head and seat and movable with reference toboth of them and oppositely curved on its opposite sides to-provide fora compensatinggg tipping in case of relative movement between theconnecting member and seat.

In testimonywhereof, I hereunto afiix my signature in the presence oftwo witnesses.

CHARLES F. KAHLER.

surfacewhich has a. convex spherical curv ture, and av ring interposedbetween the aforesaid head andbushing and Yhaving crrespondinglyconcaved inner and outer surfacesy engagingv said lconvex 4surfacesrespectively.

12. The combination. with a stay bolt i Y Witnesses:

ALBERT H. BATES, BRENNAN B. WEST.

engaging said convex

